Description 



PI Ri with 2 inner setae; P2 Ri2 with 1 outer seta; 

 P3-P4 Ri3 with 1 outer seta. 



Female. — Length of only known specimen 4.20 

 mm. Prosome in dorsal view slender ovoid; head 

 somewhat truncate. In lateral view with abrupt 

 forward slope. Th4 and Th5 separate. Prosome length 

 nearly 5 times urosome. Caudal rami about as long as 

 wide. 



Labrum with 3 large protuberances on midventral 

 surface. 



Al segment 1 with 2 strong setae. 



Male. — Unknown. 

 Remarks 



Sars' (1924, 1925) description is thorough, but 

 should be confirmed with additional specimens. Sars 

 states that Ce and Thl are fused. He did not describe 

 an inner transverse row of setules on P4 Bl, present on 

 most Mimocalanus species. The 2 strong setae on Al 

 segment 1 are unusual, and perhaps there is a third 

 strong seta. 



Distribution 



Known only from the original record, Central North 

 Atlantic, 0-3,"000 m. 



4. Mimocalanus inflatus Davis, 1949 



Mimocalanus inflatus Davis, 1949, p. 24. — Grice and 

 Hulsemann, 1965, p. 227, fig. 5o-w. — ?Grice and 

 Hulsemann, 1967, p. 20, fig. 16-18. 



Type SPECIMEN: Unknown. 



Type L0CALIT\': Northeast Pacific, 1,900-2,900 m. 



Description 



PI Ri with 2 inner setae; P2 Ri2 with 1 outer seta; 

 P3-P4 Ri3 with 1 outer seta. 



Female.— Length (1.76?-) 2.3-2.4 mm. Known for 

 only two specimens (Davis, 1949; Grice and 

 Hulsemann, 1965). 



Male. — Unknown. 



Remarks 



Grice and Hulsemann (1967) reported two small 

 specimens (1.76-2.01 mm) but the swimming feet 

 were lacking, and they questioned this identification, 

 which could be of M. ovalis or other species. 



Davis ( 1949) did not illustrate this species, and it is 

 not certain whether his specimen had P1-P4 armature 

 as described above (taken from Grice and 



Hulsemann, 1965). The only characteristic which set 

 the two specimens apart from other Mimocalanus 

 species was the inflated P2-P4 Ri2. 



Distribution 



Pacific Ocean 



Northeast: Davis (1949), 1,900-2,900 m. 

 Indian Ocean 



West: ?Grice and Hulsemann (1967), 1,000- 

 2,000 m. 

 Atlantic Ocean 

 East: Grice and Hulsemann (1965), 1,900-3,000 

 m. 



(5. Mimocalanus distinctocephalus 

 Brodsky, 1950) 



See Mimocalanus nudus Farran, 1908. 



6. Mimocalanus ovalis (Grice and 

 Hulsemann, 1965), new combination 



(Figure 160) 



Spinocalanus ovalis Grice and Hulsemann, 1965, p. 



229, fig. 7b-f. 

 ?Spinocalanus ventriosus Grice and Hulsemann, 1967, 



p. 21-22, fig. 32-34. 



Type SPECIMEN: Holotype, female, BM 1965.4.20.3. 

 Type LOCALITY: Northeast Atlantic, 1,900-5,000 m. 

 Material Studied: 2 paratypes, female (1.32 mm), 

 sample 48 (Table 3). Also the holotype of 

 Spinocalanus ventriosus, female (damaged), sample 

 43. 



Description 



Pi Ri with 2 inner setae; P2 Ri2 with no outer seta; 

 P3-P4 Ri3 with 1 outer seta. 



Female. — Length 1.16-1.52 mm. Prosome in dorsal 

 view robust ovoid; head broadly rounded. In lateral 

 view with abrupt forward slope. Th4 and Th5 

 separate; Th5 lateral corners reaching midgenital seg- 

 ment. Prosome length 3' 2 times urosome. Genital seg- 

 ment slightly longer than wide, protruding ventrally 

 one-half depth of rest of urosome. Caudal rami length 

 about equaling width. 



Al reaching only to midgenital segment; segment 2 

 length about 1 ' 2 times segment 1; segments 8-9 com- 

 pletely fused; terminal segments (Fig. 160) relatively 

 wide, short. Segments 8 through 24 with 1-2 rows of 

 minute denticles on ventral and dorsal surface, not 

 noticed on any other Spinocalanidae. Segment 1 

 damaged; armature of remaining segments as Table 

 4. 



Mn B2 with 3 inner setae (Grice and Hulsemann, 

 1965, fig. 7c). 



73 



